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Nagel F, Susemihl A, Eulberg T, Delcea M. Identification of Kazal Inhibitor Scaffolds with Identical Canonical Binding Loops and Their Effects on Binding Properties. Biochemistry 2023; 62:535-542. [PMID: 36598875 PMCID: PMC9850914 DOI: 10.1021/acs.biochem.2c00573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Kazal inhibitors hold high potential as scaffolds for therapeutic molecules, taking advantage of the easily exchangeable canonical binding loop. Different Kazal inhibitor backbones have been suggested to be therapeutically useful, but the impact of different Kazal-like scaffolds on binding properties is still largely unknown. Here, we identified trypsin-targeting human serine protease inhibitor Kazal type 1 (SPINK1) homologues in different mammalian species that cluster in two P2-P1 combinations, implying the coevolution of these residues. We generated loop exchange variants of human SPINK1 for comparison with Kazal inhibitors from related species. Using comprehensive biophysical characterization of the inhibitor-enzyme interactions, we found not only affinity but also pH resistance to be highly backbone-dependent. Differences are mostly observed in complex stability, which varies by over one order of magnitude. We provide clear evidence for high backbone dependency within the Kazal family. Hence, when designing Kazal inhibitor-based therapeutic molecules, testing different backbones after optimizing the canonical binding loop can be beneficial and may result in increased affinity, complex stability, specificity, and pH resistance.
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Affiliation(s)
- Felix Nagel
- Biophysical
Chemistry, Institute of Biochemistry, University
of Greifswald, 17489Greifswald, Germany
| | - Anne Susemihl
- Biophysical
Chemistry, Institute of Biochemistry, University
of Greifswald, 17489Greifswald, Germany,Department
of Hematology and Oncology, Internal Medicine C, University of Greifswald, 17489Greifswald, Germany
| | - Tobias Eulberg
- Biophysical
Chemistry, Institute of Biochemistry, University
of Greifswald, 17489Greifswald, Germany
| | - Mihaela Delcea
- Biophysical
Chemistry, Institute of Biochemistry, University
of Greifswald, 17489Greifswald, Germany,
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Nagel F, Susemihl A, Geist N, Möhlis K, Palm GJ, Lammers M, Delcea M. Structural Basis of the Pancreatitis-Associated Autoproteolytic Failsafe Mechanism in Human Anionic Trypsin. J Inflamm Res 2022; 15:3633-3642. [PMID: 35775010 PMCID: PMC9239388 DOI: 10.2147/jir.s367699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 05/24/2022] [Indexed: 11/23/2022] Open
Abstract
Objective Methods Results Conclusion
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Affiliation(s)
- Felix Nagel
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Anne Susemihl
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
- Department of Hematology and Oncology, Internal Medicine C, University of Greifswald, Greifswald, Germany
| | - Norman Geist
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Kevin Möhlis
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
- Helmholtz Institute for Metabolic, Obesity and Vascular Research, Leipzig, Germany
| | - Gottfried J Palm
- Synthetic and Structural Biochemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Michael Lammers
- Synthetic and Structural Biochemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Mihaela Delcea
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
- Correspondence: Mihaela Delcea, Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, Greifswald, Germany, Tel +49 3834 420 4423, Fax +49 3834 420 4377, Email
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Nagel F, Palm GJ, Geist N, McDonnell TCR, Susemihl A, Girbardt B, Mayerle J, Lerch MM, Lammers M, Delcea M. Structural and Biophysical Insights into SPINK1 Bound to Human Cationic Trypsin. Int J Mol Sci 2022; 23:ijms23073468. [PMID: 35408828 PMCID: PMC8998336 DOI: 10.3390/ijms23073468] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 03/18/2022] [Accepted: 03/21/2022] [Indexed: 02/01/2023] Open
Abstract
(1) The serine protease inhibitor Kazal type 1 (SPINK1) inhibits trypsin activity in zymogen granules of pancreatic acinar cells. Several mutations in the SPINK1 gene are associated with acute recurrent pancreatitis (ARP) and chronic pancreatitis (CP). The most common variant is SPINK1 p.N34S. Although this mutation was identified two decades ago, the mechanism of action has remained elusive. (2) SPINK1 and human cationic trypsin (TRY1) were expressed in E. coli, and inhibitory activities were determined. Crystals of SPINK1-TRY1 complexes were grown by using the hanging-drop method, and phases were solved by molecular replacement. (3) Both SPINK1 variants show similar inhibitory behavior toward TRY1. The crystal structures are almost identical, with minor differences in the mutated loop. Both complexes show an unexpected rotamer conformation of the His63 residue in TRY1, which is a member of the catalytic triad. (4) The SPINK1 p.N34S mutation does not affect the inhibitory behavior or the overall structure of the protein. Therefore, the pathophysiological mechanism of action of the p.N34S variant cannot be explained mechanistically or structurally at the protein level. The observed histidine conformation is part of a mechanism for SPINK1 that can explain the exceptional proteolytic stability of this inhibitor.
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Affiliation(s)
- Felix Nagel
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (F.N.); (N.G.); (A.S.)
| | - Gottfried J. Palm
- Synthetic and Structural Biochemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (G.J.P.); (B.G.); (M.L.)
| | - Norman Geist
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (F.N.); (N.G.); (A.S.)
| | - Thomas C. R. McDonnell
- Biochemical Engineering Department, University College London, Bernard Katz, London WC1E 6BT, UK;
| | - Anne Susemihl
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (F.N.); (N.G.); (A.S.)
- Department of Hematology and Oncology, Internal Medicine C, University of Greifswald, 17489 Greifswald, Germany
| | - Britta Girbardt
- Synthetic and Structural Biochemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (G.J.P.); (B.G.); (M.L.)
| | - Julia Mayerle
- Department of Medicine II, University Hospital Munich, Ludwig-Maximillian University Munich, 81377 Munich, Germany;
| | - Markus M. Lerch
- Department of Medicine A, University Medicine Greifswald, 17489 Greifswald, Germany;
| | - Michael Lammers
- Synthetic and Structural Biochemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (G.J.P.); (B.G.); (M.L.)
| | - Mihaela Delcea
- Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (F.N.); (N.G.); (A.S.)
- Correspondence:
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Susemihl A, Nagel F, Grabarczyk P, Schmidt CA, Delcea M. Easy Expression and Purification of Fluorescent N-Terminal BCL11B CCHC Zinc Finger Domain. Molecules 2021; 26:molecules26247576. [PMID: 34946663 PMCID: PMC8708588 DOI: 10.3390/molecules26247576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/09/2021] [Accepted: 12/12/2021] [Indexed: 12/05/2022] Open
Abstract
Zinc finger proteins play pivotal roles in health and disease and exert critical functions in various cellular processes. A majority of zinc finger proteins bind DNA and act as transcription factors. B-cell lymphoma/leukemia 11B (BCL11B) represents one member of the large family of zinc finger proteins. The N-terminal domain of BCL11B was shown to be crucial for BCL11B to exert its proper function by homodimerization. Here, we describe an easy and fast preparation protocol to yield the fluorescently tagged protein of the recombinant N-terminal BCL11B zinc finger domain (BCL11B42-94) for in vitro studies. First, we expressed fluorescently tagged BCL11B42-94 in E. coli and described the subsequent purification utilizing immobilized metal ion affinity chromatography to achieve very high yields of a purified fusion protein of 200 mg/L culture. We proceeded with characterizing the atypical zinc finger domain using circular dichroism and size exclusion chromatography. Validation of the functional fluorescent pair CyPet-/EYFP-BCL11B42-94 was achieved with Förster resonance energy transfer. Our protocol can be utilized to study other zinc finger domains to expand the knowledge in this field.
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Affiliation(s)
- Anne Susemihl
- Department of Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (A.S.); (F.N.)
- Department of Hematology and Oncology, Internal Medicine C, University of Greifswald, 17489 Greifswald, Germany; (P.G.); (C.A.S.)
| | - Felix Nagel
- Department of Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (A.S.); (F.N.)
| | - Piotr Grabarczyk
- Department of Hematology and Oncology, Internal Medicine C, University of Greifswald, 17489 Greifswald, Germany; (P.G.); (C.A.S.)
| | - Christian A. Schmidt
- Department of Hematology and Oncology, Internal Medicine C, University of Greifswald, 17489 Greifswald, Germany; (P.G.); (C.A.S.)
| | - Mihaela Delcea
- Department of Biophysical Chemistry, Institute of Biochemistry, University of Greifswald, 17489 Greifswald, Germany; (A.S.); (F.N.)
- Correspondence:
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